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Process for producing ethylene by chlorination of ethane and dehydrochlorination of ethyl chloride

a technology of ethyl chloride and ethylene, which is applied in the preparation of chloride, hydrocarbon preparation catalysts, halogenated hydrocarbon preparations, etc., can solve the problems of ethylene production, and achieve the effect of robust features and favorable economics

Active Publication Date: 2015-10-27
JES TECH LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a process for the synthesis of ethylene from ethane using two chemical reactions operated in sequence. The key feature of the invention is the use of an oxychlorination catalyst containing copper, lead, and an alkali metal chlorides which is molten under operating conditions. The process involves first converting ethane to ethylchloride and water using the oxychlorination catalyst, followed by cracking the ethylchloride to produce ethylene and hydrogen chloride using a second catalyst. By recycling the hydrogen chloride from the second reaction back to the first, there is no net consumption of this intermediate. The invention provides an alternative technology with favorable economics and robust features.

Problems solved by technology

Even under the best of conditions, numerous byproducts limit the production of ethylene.

Method used

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  • Process for producing ethylene by chlorination of ethane and dehydrochlorination of ethyl chloride
  • Process for producing ethylene by chlorination of ethane and dehydrochlorination of ethyl chloride

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[0029]The catalyst composition for the oxychlorination of ethane to ethyl chloride was 40 mol percent copper chloride, 30 mol percent potassium chloride, 10 mol percent sodium chloride, and 20 mol percent lead chloride. The reaction was run at 370° C. At steady state conditions, 81.4 percent of the ethane was unreacted, 14.0 percent converted to ethyl chloride, 0.6 percent converted to 1, 1 dichloroethane, 2.2 percent to ethylene dichloride, 1.4 percent to trichloroethane and 0.4 percent to tetrachloroethane. No carbon monoxide or carbon dioxide was detected. The ethyl chloride was cracked over a silica alumina catalyst at 350° C. to give a near quantitative yield of ethylene. The catalyst was 12.4 weight percent Al2O3 and 87.3 percent SiO2 and had a surface area of 300 m2 / g.

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Abstract

Ethylene is produced from ethane in three steps: first, ethane is oxychlorinated to produce ethyl chloride and water; second, ethyl chloride from the first step is cracked to produce ethylene and hydrogen chloride; and third, the hydrogen chloride from the second step is recycled to the front step.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a process for manufacturing ethylene from ethane. The process comprises two chemical reactions. In the first reaction, ethane, oxygen and hydrogen chloride are passed over a catalyst to produce ethyl chloride and water. The second reaction converts ethyl chloride in the presence of a second catalyst to ethylene and hydrogen chloride.BACKGROUND OF THE INVENTION[0002]One of the principal routs to the production of ethylene involves cracking ethane at high temperatures. Purified ethane obtained from refinery gas streams or from natural gas is heated to temperatures of about 816° C. The thermal cracking, which takes place without a catalyst involves free radicals and a chain reaction.[0003]The results of the thermal cracking depend on such variables as temperature, pressure and residence time, collectively referred to as cracking severity. Even under the best of conditions, numerous byproducts limit the production of ethylene....

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C07C1/30C01B7/03C07C17/154C07C2/86
CPCC07C1/30C01B7/035C07C17/154C07C19/043C07C11/04C07C2521/12C07C2521/18C07C2527/138Y02P20/582
Inventor STAUFFER, JOHN E.
Owner JES TECH LLC
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